Brush-mounting.



E. P. &T. L. LEE.

BRUSH MOUNTING. APPLICATION FILED AUG. (4.19m.

Patented Sept. 18, 1917 UNITED STATES PATENT OFFICE.

EARLE 1. LEE AND THOMAS L. LEE, OF ROCHESTER, NEW YORK, ASSIGNORS TONORTH EAST ELECTRIC COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OFYORK.

NEW

BRUSH-MOUNTING.

Specification of Letters Patent.

Patented Sept. 18, 1917.

1 To all whom it may concern:

Be it known that we, EARLE P. Lnn and THOMAS L. LEE, citizens of theUnited States, residing at Rochester, in the county of Monroe and Stateof New York, have invented certain new and useful Improvements in Brush-Mountings; and We do hereby declare the following to be a full,

clear, and exact description of the invention, such as will enableothers skilled in the art 'to which it appertains to make and use thesame.

This invention relates to means by which.

the brushes of an electric motor or generator are guided and supportedin engagement lugs, extending from the edge of the annular member andpreferably struck up integrally from the same sheet-metal. The annularmembers are arranged in superposed position, thus providing for the twoor more brushes commonly employed in direct-current machines, but themembers are preferably insulated from each other, so that they may beutilized as parts of the electric circuits of the machine.

Other objects of the invention, and the features of construction bywhich they are attained, will be set forth hereinafter, in connectionwith the description of the illustrated embodiment of the inventionv Inthe accompanying drawings Figure 1 is an elevation of a brush-mountingembodying the present invention, looking axially from the inside of the'machine,.the figure showing alsoapart of the frame or casing with whichthe brush-mounting is associated; Fig. 2 is a section on the broken line22 in Fig. 1, and in this figure the points, two curved arms 19.

commutator, one end of the armatuieshaft,

and the cooperating ball-bearing, are also shown; and Figs. 3 and 41 aretwo elevations of one of the integral sheet-metal members of thebrush-mounting.

The invention is illustrated as embodied in a four-pole electric motorof the inclosed type. Apart from the brush-mounting, the drawings showonly the commutator 10, one end of the armature-shaft12, theball-bearing 11 in which this shaft-end is supported, and a portion ofthe frame or casing of the machine. This frame comprises an endplate 13,in which the bearing 11 is mounted,'a ring 1 1, whichmay be clampedagainst the field-ring (not shown) of the machine in the usual manner,arms 15 connecting the plate 13 and the ring 14, and a band 16 whichconstitutes a removable cover, of the well-known garter type, for theopenings betweenthe arms 15. I

The machine is shown as provided with four carbonbrushes 17, which arepressed radially against the commutator at four equidistant points. Theprincipal and characteristic part of the brush-mounting resides in twosheet-metal members, of which one is shown in detail in Figs?! and 4.This member comprises an annular portion or flat ring 18, from the outeredge of which project, at diametrically opposite These arms are bent toa. position parallel with and overhanging the annular portion 18, andfrom the lateral edges of each arm two plates 20 are bent into parallelposition, these plates forming the sides of a box-like guide in whichone'of the brushes 1? slides. The back of the guide is formed by themetal of the arm.19, while the guide is closed in front by lugs 21 benttoward each other from the ends of the plates 20.

Alongside each arm 19 a lug22 is struck p a of the machine.

by whic have a right and le -hand relation. They may be convenientlyformed from sheetmetal blanks which are identical in form, but fromwhich the lugs are bent in opposite directions. These two members arearranged withthe annular portions 18 insuperposed relation, as shown, inFigs. 1 and 2, and with their various projections extending in the samedirection, and they are fixed in that position within the inner surfaceof the plate 13, by means of screws 26 which pass through registerinopenings 25 in the annular portions. To ring the brush- 'des or holdersinto the same plane, notw1thstand-,

ing the fact that the parts 18 lie in different planes, the arms 19 onone member are given a somewhatdeeper-curve than those of the othermember.

I The brushes 17 slide radially into engagement with the commutator, andare maintained in operative position by springs 27, of coiled form. Eachspring is mounted upon one of the spring-supports 23, with its outer endin engagement with the corresponding .brush, and the spring is retainedin proper correlative position with the brush and the. sup ort by reasonof the fact that its end is embraced between two flexible conductors origtails 28, by which the brush is electrica ly connected with thecircuits Each pigtail is provided with a sheet-metal clip 29, which isscrewed to one of the lugs 22, these lugs being provided with threadedopenings for that purpose, as shown .in Fi 3 and 4. v

The annular mem ers '18 constitute conductive 1paths forming parts ofthe circuits the brushes andvthroug'h the pigtails. Accordingly, the In24 are utilized as the positive and negative terminals of the brushmounting, and are shown as provided with binding-screws 30, which serveto attach the clips 31 on the ends of current-leads or wires 32, whichextend to the field-windin or the main terminals of the machine in t eusual manner. I v

' It will be apparent that the brush-mounting above described comprisesfew members, which may be made inexpensively and easily assembled in acompact relation. The invention has been shown, particularly, as adaptedto a multipolar motor or generator the arrangement being such thateach-pair of diametrically-opposite brushes is interconnected by theannular member 18 on which 'they are mounted in common. It will becurrent is conducted to and from obvious, however, that the, inventionis equally applicable to a bipolar machine, by a slight rearrangement ofparts which need not be described, and that the invention, in general,is not limited to the embodiment thereof hereinbefore described, andillustrated' in the accompanying drawings.

We claim:

l..A brush-mounting comprising a substantially flat sheet-metal ring; anarm projecting integrally from one edge'of the ring and transverse tothe brush-holder formed mtegrall .upon' said am by ends in the sheet-metthereof.

2. A brush-mounting com rising a substantially flat sheet-metal rlng; aspringsupport and an arm projecting integrally from the outer edge ofthe rin and transverse to the plane thereof; a rush-holder formedintegrally upon said arm; and a spring coiled about said spring-supportand adapted to engage a brush m t e brushholder.

3. In a dynamo-electric machine of the inclosed t pe, thecombination,with a head of the casing thereof, of two Brush-mounting devices eachcomprising a substantially flat sheet-metal ring and a brush-sup ortingmember integrally connected with t e ring at an edge thereof, said ringsbeing superposed, but insulated from each other; and means fastening therings to the casing-head coaxially with the armature-shaft of themachine. I

4. A brush-mounting comprising a sheetmetal ring; and a brush-holder, aspringsupport and a terminal-lug all struck up integrally from thesheet-metal of the ring at the outer edge thereof.

5. In a dynamo electric machine, the combination of a ring; abrush-supporting member and a spring-support projecting laterally;

from the ring; a brush movably mounted on the brush-supporting member; aspring coiled about the spring-support and havin one end in engagementwith the brush; an a pairof pi ail connectors connecting the brush and te ring, said connectors being attached to the brush in position toembrace said end of the s ring so as to prevent lateral displacement oithe spring.

6. Ina dynamo-electric machine the combination, with the frame thereof,of two brush-mounting devices each comprising a sheet-metal ring and aplurality of brush supporting members integrall connected with the ringat an edge thereo; said being superposed, but insulated from eacii lanethereof; and a to receive fasteningdevices; an armprojecting integrallyfrom one edge of the ring and transverse to the plane thereof; andmeans, carried by said am, for supporting 5 and guiding a movable brush.

8. In a dynamo-electric machine, the combination of a sheet-metal ring;a brush-supporting member projecting integrally from an edge of thering; a brush movebiy mounted on said. member; e flexible connector con-19 necting the brush and the ring; emi a main c0nduct0r also cennectaito the ring.

EARLE P. LEE.

THUS L. LEE.

